It's unclear what provoked the incident, but in the 34th minute Messi and Yanga-Mbiwa came face-to-face, with the Argentine clearly upset about something. Yanga-Mbiwa appeared to initiate the contact, leaning in with his forehead, and Messi responded by head-butting the French defender and then reaching for his throat.

Yanga-Mbiwa, who made 28 appearances in Serie A, has also played four matches for France.